Update gscholar.py, now it can filter start year and end year, also added set_cookie from response to cookie requests also added a delay option for requesting.

[amirz7676]

now it can filter data by start year and end year, also added set_cookie from response to cookie requests also added a delay option for requesting (for not getting banned).

[venthur]

Hi, I've used the idea of using set-cookie in the hope it helps a bit with google blocking requests from gscholar. Did you run some experiments that showed that it works better?

What about the other changes in this PR, do they improve the situation from being temporarily blocked by google?

[amirz7676]

Hi there, yes it worked better in my experiments, and it'll be working longer. But not too long!.
I've found a repo named 'scholar.py' it works better, i have updated it's code, currently I'm working on some way to pass google captcha manually, it works in my experiments, after debugging I'll update it to my github.